DSG-423 ENGINE CONTROLS
08-38
Engine Performance - While Under Load
SYMPTOM POSSIBLE CA U S E
Engine Stalls/Quits • Faulty OEM Drivers Safety Shut-off Seat Switch
• Low Battery Voltage
• Low Fuel Pressure
• OEM Safety Shutdowns
• Bad MAP Sensor
• Air Restriction
• Coil Failure
• Fuel Mixer Binding (Dry Fuel)
Runs Rough • Ground Loss
• Misrouted Spark Plug Wires
• Fuel System Failure
• Vacuum Leak
• Wiring Failure
• Low Fuel Pressure
• Spark Plugs Fouled
• Incorrect Valve Timing
Misses • Fuel System Failure
• Misrouted Spark Plug Wires
• Spark Plug Gap Too High
• Spark Plugs Fouled
• Cracked Spark Plug Insulator
• Incorrect Valve Timing
• Compression Loss
Hesitation/Stumble • Low Fuel Pressure
• Spark Plugs Fouled
• MAP Sensor Vacuum Signal Loss
Surge • Low Fuel Pressure
• Map Sensor Failure
• Application or Ancillary System Momentarily Binding During
Load or Unload
Backfires • Faulty OEM Drivers Safety Shut-off Seat Switch
• Fouled Spark Plugs
• Spark Plug Wire Broke
• GCP Momentary Ground Loss
• Excess Lean Condition
• Fuel Lock-Off Leaking (Dry Fuel)
• Intake Manifold Leak
• Bad Intake Valve
Lack of Power • Ancillary Components Binding
• Intake Air Restriction
• Crossed Spark Plug Wires
• Spark Plugs Fouled
• Fuel System Failure
• Low Fuel Pressure
• Low Cylinder Compression
Spark Knock • Poor Quality or Contaminated Fuel
• Carbon Build-up
• Wrong Spark Plugs (Too High Heat Range)
• Fuel Delivery System
• PCV Sy
stem
• Fuel Selection Timing
• Cylinder Hot Spots
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